Table 1. Preoperative characteristics of colorectal cancer patients according to age group.
| Characteristic | N | <60 years (n=47), n (%) | 60–79 years (n=218), n (%) | ≥80 years (n=81), n (%) | P value |
|---|---|---|---|---|---|
| Gender | <0.001 | ||||
| Male | 199 | 27 (57.4) | 141 (64.7) | 31 (38.3) | |
| Female | 147 | 20 (42.6) | 77 (35.3) | 50 (61.7) | |
| Comorbidities | <0.001 | ||||
| No | 87 | 31 (66.0) | 50 (22.9) | 6 (7.4) | |
| One or more | 259 | 16 (34.0) | 168 (77.1) | 75 (92.6) | |
| ASA-PS class | <0.001 | ||||
| 1 | 120 | 37 (78.7) | 70 (32.1) | 13 (16.0) | |
| ≥2 | 226 | 10 (21.3) | 148 (67.9) | 68 (84.0) | |
| Modified frailty index | <0.001 | ||||
| 0–1 | 208 | 44 (93.6) | 128 (59.0) | 36 (44.4) | |
| ≥2 | 138 | 3 (6.4) | 90 (41.0) | 45 (55.6) | |
| BMI (kg/m2) | 0.524 | ||||
| <25 | 270 | 36 (76.6) | 167 (76.6) | 67 (82.7) | |
| ≥25 | 76 | 11 (23.4) | 51 (23.4) | 14 (17.3) | |
| PNI | <0.001 | ||||
| <40 | 90 | 5 (10.6) | 46 (21.1) | 39 (48.1) | |
| ≥40 | 256 | 42 (89.4) | 172 (78.9) | 42 (51.9) | |
| Hb (g/dL) | <0.001 | ||||
| <11 | 136 | 12 (25.5) | 75 (34.6) | 49 (60.5) | |
| ≥11 | 210 | 35 (74.5) | 143 (65.4) | 32 (39.5) | |
| Alb (g/dL) | <0.001 | ||||
| <3.5 | 105 | 7 (14.9) | 57 (26.1) | 41 (50.6) | |
| ≥3.5 | 241 | 40 (85.1) | 161 (73.9) | 40 (49.4) | |
| CEA (ng/mL) | 0.038 | ||||
| <5 | 198 | 26 (55.3) | 135 (61.9) | 37 (45.7) | |
| ≥5 | 148 | 21 (44.7) | 83 (38.1) | 44 (54.3) |
ASA-PS, American Society of Anesthesiologists Physical Status; BMI, body mass index; PNI, prognostic nutrition index; Hb, hemoglobin; Alb, albumin; CEA, carcinoembryonic antigen.